Dear all: I'm using PETSC iterative solver(PCILU & KSPGMRES) in OOQP, but when the to be solved matrix is ill-posed, say condition number ~ 1e+4, then, KSPGMRES will exceed its maximal iteration number(default as 10000), while when I checked the same data with cholmod direct solver, it can solve the problem and return an answer correctly.
Does it mean the iterative solver(like GMRES) relies more on the well-pose matrix than cholmod direct solver? How can I improve the case to avoid KSPGMRES fail case? Your answer is appreciated. Thanks, Debao -- The information contained in this communication and any attachments is confidential and may be privileged, and is for the sole use of the intended recipient(s). Any unauthorized review, use, disclosure or distribution is prohibited. Unless explicitly stated otherwise in the body of this communication or the attachment thereto (if any), the information is provided on an AS-IS basis without any express or implied warranties or liabilities. To the extent you are relying on this information, you are doing so at your own risk. If you are not the intended recipient, please notify the sender immediately by replying to this message and destroy all copies of this message and any attachments. ASML is neither liable for the proper and complete transmission of the information contained in this communication, nor for any delay in its receipt.
